/**
 * Copyright (C) 2002-2015   The FreeCol Team
 * <p>
 * This file is part of FreeCol.
 * <p>
 * FreeCol is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 * <p>
 * FreeCol is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * <p>
 * You should have received a copy of the GNU General Public License
 * along with FreeCol.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.sf.freecol.client.gui;

import java.awt.Component;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;

import javax.swing.JInternalFrame;
import javax.swing.SwingUtilities;


/**
 * The mouse adapter to handle frame movement.
 */
public class FrameMotionListener extends MouseAdapter implements MouseMotionListener
{

    private final JInternalFrame f;

    private Point loc = null;


    FrameMotionListener( JInternalFrame f )
    {
        this.f = f;
    }

    @Override
    public void mouseDragged( MouseEvent e )
    {
        if ( loc == null || f.getDesktopPane( ) == null || f.getDesktopPane( ).getDesktopManager( ) == null )
        {
            return;
        }

        Point p = SwingUtilities.convertPoint( ( Component ) e.getSource( ), e.getX( ), e.getY( ), null );
        int moveX = loc.x - p.x;
        int moveY = loc.y - p.y;
        f.getDesktopPane( ).getDesktopManager( ).dragFrame( f, f.getX( ) - moveX, f.getY( ) - moveY );
        loc = p;
    }

    //@Override
    //public void mouseMoved(MouseEvent arg0) {
    //}

    @Override
    public void mousePressed( MouseEvent e )
    {
        if ( f.getDesktopPane( ) == null || f.getDesktopPane( ).getDesktopManager( ) == null )
        {
            return;
        }
        loc = SwingUtilities.convertPoint( ( Component ) e.getSource( ), e.getX( ), e.getY( ), null );
        f.getDesktopPane( ).getDesktopManager( ).beginDraggingFrame( f );
    }

    @Override
    public void mouseReleased( MouseEvent e )
    {
        if ( loc == null || f.getDesktopPane( ) == null || f.getDesktopPane( ).getDesktopManager( ) == null )
        {
            return;
        }
        f.getDesktopPane( ).getDesktopManager( ).endDraggingFrame( f );
    }

}
